I believe she has one of the most accurate cosplays of Poison ever. And I'm not joking and I'm not being bootlicker, it's because I have seen many Poison cosplays and I can't understand why, being such an easy cosplay to do, many people keep mistaking in many small details.
That's a myth. When Final Fight came out it got flak because you were beating up on a girl. Capcom ended up altering the newer games so that Poison didn't look like a girl anymore and called Poison a guy in the instruction manual or something.
Bottom line: Poison's a girl. That rumor is a misunderstanding.